It is not the easiest thing to find out. I learned the hard way and now we breed :) The best way is to take them to a vet to find out. Otherwise, carefully flip them them over and rub there tummy. then try to unbury their private area which is rite near their tail and when it is exposed you need to sort of push up and see if anything "pops" out of the hole or not..... If it does. Surprise - it is a BOY! If not - Surprise - it is a GIRL! It is easier to show than talk thru on a computer. Best bet - go to the vet, it is usually like $20-25.00 and then you will know if your bunny is healthy anyways.